X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.123] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3640932 for flyrotary@lancaironline.net; Wed, 13 May 2009 09:54:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.123; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta03.mail.rr.com with ESMTP id <20090513135353797.DUAO2590@cdptpa-omta03.mail.rr.com> for ; Wed, 13 May 2009 13:53:53 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Fuel Pressure Regulator \ Vacuum Leak Date: Wed, 13 May 2009 09:53:53 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C9D3B0.B9EC3660" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: Thread-Index: AcnTX0uS9fKGJwErTWSTymuV5bPZ/gAccSnA X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090513135353797.DUAO2590@cdptpa-omta03.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C9D3B0.B9EC3660 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Bobby, the way I read that statement from aeromotive - it's relative to using a hand pump to establish the vacuum. Since the hand pump develops a very small volume of "static" pressure difference - any slight leak could indeed "deplenish" its vacuum very quickly and give poor results. However, when you have a 1300 CC dynamic pump (your engine) pulling down the vacuum continuously - a slight air leak around the adjustment screw should not normally be noticeable. So its my opinion, that in regular use a normal air leak around the screw would probably not have an effect - only when attempting to adjust it using an hand air pump. However, if you have an abnormal air leak (excessive) around the screw and have your manifold pressure sensor on the same line then it certainly could have an effect. I personally run two separate lines from the manifold (one from each rotor intake), "H" them together to dampen pulsation and on to the EC2/3 pressure sensors - nothing else on these two manifold pressure lines. I run a separate line for my manifold pressure gauge and pressure regulator. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes Sent: Tuesday, May 12, 2009 9:11 PM To: Rotary motors in aircraft Subject: [FlyRotary] Fuel Pressure Regulator \ Vacuum Leak I reinstalled my EC2 yesterday after a few changes by Tracy. I immediately discovered a new problem. The lowest MAP address being used was 62 and both primary and secondary injectors fired at all MP and RPM. With Tracy on the phone and Dennis H supervising my efforts we found a small vacuum leak at the Aeromotive A1000-6 fuel pressure regulator. After switching the two MP tubes between A&B controllers the A controller starter working as expected. The EC2 staged properly with lower MAP addresses being accessed. When reinstalling the EC2 I had switch the MP tubes from my usual configuration. A couple of weeks ago I had noticed my B controller was not working as expected. I had to continually adjust the mixture to keep the engine running. Now I know why. What was unexpected is one MP tube is used for the fuel pressure regulator, B Controller and my Advanced EFIS engine monitor. The Advanced engine monitor was not affected by the slight leak. On the other hand the EM3 did see the leak and was showing static pressure regardless of MP. Here is a note from the Aeromotive web site. NOTE: Testing the enclosed regulator by applying air pressure or vacuum to the vacuum port with a hand-held pump will yield poor results, due to the slight air leakage through the adjustment screw threads. This minute leakage, which is typical of all adjustable fuel pressure regulators, does not, in any way, affect the performance of the regulator. Bobby Hughes __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_001C_01C9D3B0.B9EC3660 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bobby, the way I read that = statement from aeromotive – it’s relative to using a hand pump to establish = the vacuum.  Since the hand pump develops a very small volume of = “static” pressure difference - any slight leak could indeed = “deplenish” its vacuum very quickly and give poor results.  However, when you have = a 1300 CC dynamic pump (your engine)  pulling down the vacuum continuously = - a slight air leak around the adjustment screw should not normally  be = noticeable.

 

So its my opinion, that in regular = use a normal air leak around the screw would probably not have an effect = – only when attempting to adjust it using an hand air pump.  However, if = you have an abnormal air leak (excessive) around the screw and have your manifold pressure sensor on the same line then it certainly could have an = effect.

 

I personally run two separate lines = from the manifold (one from each rotor intake), “H” them together = to dampen pulsation and on to the EC2/3 pressure sensors – nothing = else on these two manifold pressure lines.  I run a separate line for my = manifold pressure gauge and pressure regulator.  =

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Tuesday, May 12, = 2009 9:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Fuel = Pressure Regulator \ Vacuum Leak

 

I reinstalled my EC2  yesterday after a few = changes by Tracy. I immediately discovered a new problem. The lowest MAP address being used = was 62 and both primary and secondary injectors fired at all MP and RPM. With = Tracy on the = phone and Dennis H supervising my efforts we found a small vacuum leak at the = Aeromotive A1000-6 fuel pressure regulator. After switching the two MP tubes = between A&B controllers the A controller starter working as expected. The = EC2 staged properly with lower MAP addresses being accessed. When = reinstalling the EC2 I had switch the MP tubes from my usual configuration. A couple = of weeks ago I had noticed my B controller was not working as expected. I = had to continually adjust the mixture to keep the engine running. Now I = know why. What was unexpected is one MP tube is used for the fuel pressure = regulator, B Controller and my Advanced EFIS engine monitor. The Advanced engine = monitor was not affected by the slight leak. On the other hand the EM3 did see = the leak and was showing static pressure regardless of MP. Here is a note = from the Aeromotive web site.

 

 

 

 

NOTE: Testing the enclosed regulator by applying air = pressure or vacuum to the vacuum port with a

hand-held pump will yield poor results, due to the slight air leakage through the adjustment screw

threads. This minute leakage, which is typical of all adjustable fuel pressure regulators, does not, in any

way, affect the performance of the regulator.

 

Bobby Hughes 



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3267 (20080714) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

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